Panasonic has posted the Firmware update for the HPX-500 to use E cards

Downloads & Updates - Support - The Beauty of P2 HD (http://www.panasonic.com/business/provideo/p2-hd/downloads-and-updates.asp)

I installed on mine and it worked although I don't have an E card yet to test it on

There is a slightly newer version of this firmware upgrade since the first release.